DMA interrupt enable 1

Number	TBRegisterNumber::$CD
Readable	TBRegisterReadable::Yes
Writable	TBRegisterWritable::Yes
Short Description	ShortDesc::CTC Interrupts that can override DMA

 bit 7 = ctc channel 7 zc/to
 bit 6 = ctc channel 6 zc/to
 bit 5 = ctc channel 5 zc/to
 bit 4 = ctc channel 4 zc/to
 bit 3 = ctc channel 3 zc/to
 bit 2 = ctc channel 2 zc/to
 bit 1 = ctc channel 1 zc/to
 bit 0 = ctc channel 0 zc/to

• Set bits indicate the corresponding interrupt will interrupt a dma operation when in hw im2 mode

soft reset = 0x00

Because interrupts are only sampled at the end of an instruction by the Z80, each time the dma is interrupted one instruction of progress is made in the main program.